1801  * Get the index of the actuator that will serve bio.
4777  * Perform a linear scan of each actuator, until an actuator is found
4779  * actuator is below the threshold (see comments on
4781  * next actuator (comments on this extra condition below), and there
4782  * is a queue that contains I/O for that actuator. On success, return
4839 	 *  If some actuator is underutilized, but the in-service  in bfq_select_queue()
4840 	 *  queue does not contain I/O for that actuator, then try to  in bfq_select_queue()
4841 	 *  inject I/O for that actuator.  in bfq_select_queue()
5487 	 * longer, then cycle over all possible per-actuator bfqqs in  in bfq_exit_icq()
5489 	 * therefore on its unused per-actuator fields being NULL.  in bfq_exit_icq()
5784 	 * each actuator. Therefore some actuator may be  in bfq_do_or_sched_stable_merge()
7188 	unsigned int actuator;  in bfq_exit_queue()  local
7197 	for (actuator = 0; actuator < bfqd->num_actuators; actuator++)  in bfq_exit_queue()
7198 		WARN_ON_ONCE(bfqd->rq_in_driver[actuator]);  in bfq_exit_queue()
7264 	 * Set zero as actuator index: we will pretend that  in bfq_init_queue()
7265 	 * all I/O requests are for the same actuator.  in bfq_init_queue()
7295 		 * actuator limit.  in bfq_init_queue()
7300 			pr_crit("Falling back to single actuator mode.\n");  in bfq_init_queue()
7312 	/* Otherwise use single-actuator dev info */  in bfq_init_queue()